The SGA Stock is an ambidextrous, user-configurable buttstock designed to add much-needed adjustability to the tried and true Mossberg 500/590/590A1 12ga series of shotguns. Featuring a spacer system for length of pull adjustment, improved grip ergonomics, recoil-reducing butt-pad, optional cheek risers for use with optics/raised sights, and other accessories, the Mossberg SGA brings Magpul design and engineering to another classic American firearm.